it could very well be the rear main... make sure that it isn't dripping from somewhere higher up... I'd be suprised if it wasn't dripping then all of the sudden started coming out at a noticeable pace, also, mobil 1 and synthetic oils are fantastic and I swear by them. However, they are also thinner so it's easier for them to get through small spaces and leak.... there greatest asset is their greatest downfall.... Do an inspection and see if you can find oil anywhere else above it, if not then wipe it all off/clean it up (check your oil level) and start the car for a minute and watch underneath and make sure that's really where it's coming from, if it is then you may have a rear main problem...
